Top 50 SF Novels Intermeme

After the fifth or so time I saw this turn up on my flist, I gave in. Modified version from and by elynne.

( This is a list of the 50 most significant science fiction/fantasy novels, 1953-2002, according to the Science Fiction Book Club.... )

I'm sorta surprised "The Gate to Women's Country" by Sheri S. Tepper isn't here. Nor "A Case of Conscience" by James Blish. I wonder what other omissions I'm not noticing.